/**
 * Node-jst for browsers
 * Copyright(c) 2011 Shaun Li <shonhen@gmail.com>
 * MIT Licensed
 */

// filters

var htmlCodes = {'&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;'},
    htmlre = /&(?!\w+;)|<|>|"/g,
    htmlEscape = function (src) { return htmlCodes[src]; },
    linere = /(\r\n|\r|\n)/g;

var filters = {};

;(function(exports) {

exports.convert = function(src) {
  return src.split('|').reduce(function(varname, filter) {
    return 'filters.' + filter + '(' + varname + ')';
  });
}

exports.e = exports.escape = function(src) {
  return typeof src !== 'string' ? src : src.replace(htmlre, htmlEscape);
}

exports.linebreaks = function(src) {
  return '<p>' + src.split(/\r\n|\n/g).join('</p><p>') + '</p>';
}

exports.linebreaksbr = function(src) {
  return src.replace(linere, '<br>$1');
}

exports.add = function(value) {
  return function(src) { return Number(value) + Number(src); };
}

})(filters);

// compiler

var jst = {};

;(function(exports) {

var _cache = {},
    _options = {
      useIt: false
    };

exports.addFilter = function(name, fn) {
  filters[name] = fn;
}

exports.addFilters = function(newFilters) {
  for (var name in newFilters)
    filters[name] = newFilters[name];
}

var prefixes = {
      n: {s: '"', c: '', v: ''},
      s: {s: '', c: '"; ', v: '" + '},
      c: {s: ' out += "', c: ' ', v: ' out += '},
      v: {s: ' + "', c: '; ', v: ' + '},
      end: {s: '"; ', c: ' ', v: '; '}
    },
    codere = /\{[%\{] (.+?) [%\}]\}/g;

var compile = exports.compile = function(ctx) {
  var m, i = 0, code = 'var out = ', last = 'n';

  _options.useIt = /{{ (e\()?it\./.test(ctx);

  ctx = ctx.replace(/[\t\r\n]/g, '').replace(/\{#.+?#\}/g, '')

  if (!_options.useIt) {
    code += '""; with(it) {';
    last = 'c';
  }

  while ((m = codere.exec(ctx)) !== null) {
    if (m.index > 0 && m.index > i) {
      code += prefixes[last]['s'] + ctx.substring(i, m.index).replace(/"/g, '\\"');
      last = 's';
    }

    if (m[0].indexOf('{%') === 0) {
      code += prefixes[last]['c'] + m[1];
      if (/\)$/.test(m[1])) code += ';';
      last = 'c';
    } else if (m[0].indexOf('{{') === 0) {
      code += prefixes[last]['v'] + filters.convert(m[1]);
      last = 'v';
    }

    i = m.index + m[0].length;
  }

  if (i < ctx.length) {
    code += prefixes[last]['s'] + ctx.substring(i).replace(/"/g, '\\"');
    last = 's';
  }

  code += prefixes['end'][last];

  if (!_options.useIt)
    code += '} ';

  code += 'return out;';
  //console.log(code);

  var fn = new Function('it, filters', code);

  return function(args) {
    return fn.call(this, args, filters);
  }
}

var render = exports.render = function(ctx, args) {
  var ck = crc32(ctx),
      fn = _cache[ck];

  if (typeof fn === 'undefined') {
    fn = _cache[ck] = compile(ctx);
  }

  return fn(args);
}

/**
 * Calculates the CRC32 checksum of a string.
 *
 * @param {String} str
 * @param {Boolean} hex
 * @return {String} checksum
 * @api public
 */
function crc32(str, hex) {
  var crc = ~0, i;
  for (i = 0, l = str.length; i < l; i++) {
    crc = (crc >>> 8) ^ crc32tab[(crc ^ str.charCodeAt(i)) & 0xff];
  }
  crc = crc ^ -1;
  return hex ? crc.toString(16) : crc;
};

var crc32tab = [
  0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
  0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
  0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
  0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
  0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
  0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
  0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
  0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
  0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
  0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
  0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
  0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
  0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
  0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
  0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
  0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
  0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
  0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
  0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
  0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
  0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
  0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
  0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
  0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
  0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
  0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
  0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
  0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
  0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
  0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
  0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
  0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
  0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
  0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
  0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
  0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
  0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
  0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
  0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
  0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
  0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
  0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
  0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
  0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
  0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
  0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
  0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
  0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
  0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
  0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
  0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
  0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
  0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
  0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
  0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
  0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
  0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
  0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
  0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
  0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
  0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
  0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
  0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
  0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
];

})(jst);

